If you’re flying through the San Francisco International Airport soon, I’ve got good news. Minimum connection times at SFO from international to domestic flights are generally lower compared to other major airports.
I’ve connected from international flights to domestic flights at SFO many times. On average, it takes around an hour and a half depending on the airline(s) that I’m flying. The longest time that it ever took was 3 hours, and the shortest time that it ever took was 45 minutes. It’s impossible to know ahead of time how long it’s going to take, so I highly recommend booking flights with longer connection times.
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What is the minimum connection time at SFO for international to domestic flights (and vice versa)?
The San Francisco International Airport has two international terminals (one in Terminal 1, and the other in Terminal 3). Your international flight will more than likely be arriving at the A or G gates.
Domestic flights do operate out of both the A and G gates from time to time, but there’s a very high likelihood that your domestic connection will be departing from gates B, C, D, E, or F. It all depends on the airline that you’re flying.
That being said, here are the minimum connection times that you can expect when flying international in or out of SFO:
International to domestic flights
All international passengers arriving at SFO (regardless of having a connection or not), must pass through customs and passport control. This takes time, and therefore, I wouldn’t be comfortable with anything less than a 2 hour connection time.
Yes, I have done it in far less time than that. However, if things are busy, it’ll take a lot longer. It’s better to be safe than sorry. Give yourself at least 2 hours. Your sanity will thank you for it.
Domestic to international flights
Connection times for domestic to international flights at SFO are much lower. One hour is all you really need, since there are no additional customs or security checks if you’re not changing terminals.
That being said, it’s important to know that there are 3 main terminals at SFO. You can freely walk between Terminals 2 and 3 without having to re-clear security, but you will have to go through a security checkpoint to get into Terminal 1.
Pro tip: if you need to access the A gates from the G gates (or vice versa), use the walkway connecting these two international terminals. There is a designated security checkpoint there, which is much faster than the main security checkpoint.
A brief overview of the terminal layout at the San Francisco International Airport
Thanks to its simplistic terminal design, SFO is easily walkable from one end to the other. There are 3 terminals:
- Terminal 1: A and B gates (A is a one of two international terminals)
- Terminal 2: C and D gates
- Terminal 3: E, F, and G gates (G is the other international terminal)
Each terminal has their own designated security checkpoints. However:
- You can walk between Terminal 1 (B gates) and the international terminal (A gates only) without having to re-clear security.
- You can freely walk between Terminal 2 (C and D gates), Terminal 3 (E and F gates), and the international terminal (G gates only) without having to re-clear security.
- Even though you’ll have to re-clear security to move between certain terminals, you can still walk between them all without ever having to go outside. The inter-terminal walkways at SFO are extremely convenient and easy to find.
The reason why short international to domestic connection times can be tricky at SFO
My biggest grape with SFO is the fact that it’s not possible to walk between the two international terminals (A and G) without having to re-clear security.
They are located adjacent to one another, and it’s only a five minute walk between them. However, they are not connected airside, which could make some international connections inconvenient.
For example, I recently flew into SFO and arrived at Terminal 1 (B gates). I was hoping to be able to simply walk over to the G gates in Terminal 3 (via the A gates), hang out there for a bit (plane spotting near the G gates is a great way to kill time), and then walk the rest of the way over to the F gates for my connecting flight.
However, although it is possible to walk from A to G without going outside, it requires re-clearing the security checkpoint. Until they allow that, you have to prepare for the possibility of needing to re-clear security when moving between certain terminals at SFO.
Walking times between all terminals at SFO
Despite the inconvenience of some terminals not being connected to others behind the security checkpoint, walking times between all terminals at SFO aren’t all that bad actually.
The San Francisco International Airport is my third most visited airport in the world, and this is how long it normally takes me to move between terminals:
A gates (Terminal 1) to:
- B gates: 3 minutes
- C gates: 6 minutes (and you’ll need to re-clear security)
- D gates: 9 minutes (and you’ll need to re-clear security)
- E gates: 12 minutes (and you’ll need to re-clear security)
- F gates: 6 minutes (and you’ll need to re-clear security)
- G gates: 3 minutes (and you’ll need to re-clear security)
B gates (Terminal 1) to:
- A gates: 3 minutes
- C gates: 3 minutes (and you’ll need to re-clear security)
- D gates: 6 minutes (and you’ll need to re-clear security)
- E gates: 9 minutes (and you’ll need to re-clear security)
- F gates: 9 minutes (and you’ll need to re-clear security)
- G gates: 6 minutes (and you’ll need to re-clear security)
C gates (Terminal 2) to:
- A gates: 6 minutes (and you’ll need to re-clear security)
- B gates: 3 minutes (and you’ll need to re-clear security)
- D gates: 3 minutes
- E gates: 6 minutes
- F gates: 6 minutes
- G gates: 9 minutes
D gates (Terminal 2) to:
- A gates: 9 minutes (and you’ll need to re-clear security)
- B gates: 6 minutes (and you’ll need to re-clear security)
- C gates: 3 minutes
- E gates: 3 minutes
- F gates: 6 minutes
- G gates: 9 minutes
E gates (Terminal 3) to:
- A gates: 9 minutes (and you’ll need to re-clear security)
- B gates: 6 minutes (and you’ll need to re-clear security)
- C gates: 3 minutes
- D gates: 3 minutes
- F gates: 3 minutes
- G gates: 6 minutes
F gates (Terminal 3) to:
- A gates: 6 minutes (and you’ll need to re-clear security)
- B gates: 9 minutes (and you’ll need to re-clear security)
- C gates: 6 minutes
- D gates: 6 minutes
- E gates: 3 minutes
- G gates: 3 minutes
G gates (Terminal 3) to:
- A gates: 3 minutes (and you’ll need to re-clear security)
- B gates: 6 minutes (and you’ll need to re-clear security)
- C gates: 9 minutes
- D gates: 9 minutes
- E gates: 3 minutes
- F gates: 3 minutes
Note that it may take longer depending on how much luggage you have. Throw a couple of ornery kids into the mix, and there’s a pretty good chance that you’re going to be hating life by the time you reach your connecting gate.
What is the ideal international to domestic connection time at SFO (and vice versa)?
Whenever planning a connection at SFO, I tend to plan for the worst but hope for the best. International to domestic connections will generally take longer than domestic to international, so it behooves you to plan ahead. The following are my ideal connection times at SFO – at least in regards to international flights:
International to domestic flights
Call me paranoid, but to make sure that I wouldn’t run into any problems at all, I would personally want a 4 hour connection time for an international to domestic flight at SFO (if I could get it). I once flew into San Francisco on an Icelandair 767-300 (in economy class), and had approximately 50 minutes to make a domestic connection down to SAN. I made it, but it was a traumatic enough to scar me for life (lol). I was all about long connections from that point forward.
You could probably be fine with a 2 hour connection time. 3 hours would be ideal, since you’ll never really know how long it’s going to take to get through customs (and then recheck any baggage).
Domestic to international flights
My ideal time for a no-stress domestic to international connection would be 3 hours. That would be enough time to allow for any minor flight delays, the possible need to re-clear security, and the opportunity to grab a quick bite to eat before the connecting flight.
Tips for fast and easy international to domestic connections at SFO
Most of the time, international to domestic connections at the San Francisco international Airport will be easy. The signage is very clear, and it’ll be pretty obvious what you need to do and where you need to go.
If you’re still feeling a bit worried, here are some tips that’ll make the process go much smoother:
- Check ahead of time to find out where your international flight will arrive, and where your domestic flight will depart. Knowing this info ahead of time will give you time to mentally prepare for what’s ahead.
- Sign up for Global Entry or use the Mobile Passport app to speed up the process of going through customs. I highly recommend reading my Mobile Passport vs Global Entry comparison to help you decide which program is right for you.
- If at all possible, pack light! All international passengers arriving at SFO will need to retrieve their luggage before proceeding through customs – luggage is just going to weigh you down (and cause you to curse like a sailor depending on how heavy it is).
CM
Was this written before the two new walkways at the end of 2021? Facing a 53 minute connection shortly.
Scott (SANspotter)
Yes, this was written with those walkways in mind. You’ll have no issues making a 53 minute connection if you’re going from one domestic flight to another (or going from a domestic to an international flight). It’ll be really (really) tight if you’re doing an international to domestic connection.
Zannie
Very informative to see this article! I’m facing short connection time (41 minutes) from domestic-> international ( terminal 2-> G gate). I don’t know if I can make it. Based on your estimate, it would take 9 minutes. Is this by walking or via Airtrain? Do you have any tips or advice to board on time?
Scott (SANspotter)
Hey Zannie – glad you found this helpul! That estimate is for walking, because you’d have to exit the terminal and go through security again if you take the train. But yes, you can walk from T2 to G airside (behind security) in 9(ish) minutes at a semi-fast pace. It’ll take a few more minutes if you’re more casual about it.
41 minutes is totally doable if you don’t waste any time!
Nancy
So are you saying the taking the air train, bc you exit the terminal, is longer than walking? We’re arriving D gates and depart A gates w 45 minute layover. Any suggestions are helpful … newbies to SFO
Scott (SANspotter)
Hi Nancy – in my experience, it’ll be faster to walk than to take the train because it involves so many steps. It might be quicker if you’re a slow walker, but at an average pace, walking is just as fast.
45 minutes is not a lot of time to get from D to A! You’ll have to go through the security checkpoint once you get to A, so that will take a bit of extra time. It’s not an impossible connection to make though. Just keep moving and you’ll be fine.
Nancy
Thank you for your experience and assurance, very helpful, Scott. I have been keeping an eye on this week’s departures into SFO bc, obviously a late arrival will dfntly complicate our connection. It’s alaska/horizon and twice this week they have been 15-20 minutes late leaving our origin. Once landed we’ll hurry along and hpfly the security check point entering the A gates won’t delay us – it sounds like 30 minutes might not work though … if that’s what we’re left with
Scott (SANspotter)
I think you’ll be ok even if you’re a little late. If time is especially tight, it’s ok to ask people ahead of you in line at the security checkpoint if you can squeeze ahead of them. Just be polite about it, and you’ll get through.
Nancy
So sorry … a bit more help if you don’t mind. I don’t see a clear way from D gates to A security. I wonder what I’m missing bc I see security at F gates too. I see that I come out of D gates and turn right at Alaska lounge then follow around E around to F where F1 security check is before I get to the moving walkway. Once at the moving walkway, escalator up then left to A gates security
Scott (SANspotter)
No problem! Unless something has changed since the last time I was at SFO (2 months ago), getting into terminal A from any other terminal (except B perhaps) will require going through a security checkpoint.
If you walk counter clockwise from D to G, you can use the usually-less-busy security checkpoint to get into A (it’s near the entrance of terminal G). If you walk clockwise from D to A, you’ll have to exit the secure area and go through the main security entrance for A with everyone else.
Going counter clockwise (from within the secure area) from D to G will be the fastest way IMHO.
Ms. D
How far is the luggage drop off from security/passport control? I will be checking in 2 bags so I need to pick them up and recheck them. I’m a bit worried about missing my connecting flight to PHX as my layover is only 2.45 hrs.
Scott (SANspotter)
It’s not far – there is a baggage recheck area immediately outside the customs exit. Even if there wasn’t, 2 hours and 45 minutes is more than enough time for an international to domestic connection at SFO (even with luggage to check).
Kellie Adolfae
I’m so happy I found your article! First time traveling internationally from Mexico. Do you get your checked bags before immigration? We have 2.5 hours and I’m stressed!
Scott (SANspotter)
Glad you found this helpful Kellie! When you get off the plane from Mexico, the first thing you’ll do is go though passport control. You’ll then be required to retrieve your luggage before going through customs. Once through the customs checkpoint, there will be a place to recheck your luggage to your final destination. Have a good trip!
Joshua Goh
Hey Scott! I’m flying internationally with United Airlines into SFO and taking a domestic connection out (I got a 1 hr 45mins layover and I believe UA goes from G gates to F gates). Based on your article, I would have to clear passport control /customs, and then recheck luggage + clear security to get into the domestic terminal 3?
Scott (SANspotter)
Hey Joshua – yup, that’s exactly it! I recently did exactly that (international arrival connecting to a domestic United flight) and it took about 45 minutes to get through everything.
Joshua Goh
Thanks for the reply Scott, hopefully I’ll get through in the same time as you did!
Megan Toh
Hi Scott, thanks for the helpful article! I have a 1h 30 mins connection domestic > international flight. I do have to go through passport control but no security clearance right? Hoping the queue for passport control is not too bad.
Scott (SANspotter)
Hi Megan – nope, going from a domestic flight to international will not require going through passport control. It may not even require going through security (it just depends on what terminal you fly in and out of). Even if you do have to go through security, 1.5 hours will be more than enough time. Have a good trip!