I am flying from New Orleans to Dulles (IAD) on United Express, and from IAD to Frankfurt on United. I have a short connection (45 minutes) in IAD.

I'm trying to figure out how can I make it:

Will I need to go throughout security and border check since I'm leaving the US? How big is IAD airport? and are there different terminals for domestic and international flights? If so, how long would it take to walk between them?

  • The USA does not have exit border checks. International flights leave from several Dulles terminals depending on airline. If your flight from New Orleans is on the same airline (or airline alliance) you should not have a problem, within one terminal. If you have to change buildings (note that C/D are same building), you will have to move fast. Oct 26, 2018 at 14:53
  • I'm flying in United and United express. Is it count as the same airline? Thank you!
    – Shir
    Oct 26, 2018 at 18:17
  • Hi new user! "United Express rofl" is a "partner" airline of United. It's not a real airline.
    – Fattie
    Oct 27, 2018 at 4:04

3 Answers 3


There are no exit formalities for leaving the U.S., and there is no distinction between international and domestic departures at Dulles, as is the case at most U.S. airports. Dulles is spread out but not unusually so, and all of the midfield concourses at Dulles (A/B and C/D) are connected airside, without the need to re-clear TSA security.

The main trouble you have is variability. United-operated international flights almost always depart from gates on Concourse C or D, but if Lufthansa or another partner is operating the flight, it could depart from B. United Express regional jets mostly use Concourse A, but they can also arrive at Concourses C or D. That makes for a lot of combinations, which wouldn't be so bad except that which modes of transportation— foot, AeroTrain, or "mobile lounge"— you can use to transfer from one to another, and which ones are recommended, will vary depending on the pair.

United's terminal map is not to scale, which doesn't help with planning.

United Airlines map of IAD showing connections

If I had to place bets, I'd say you will probably arrive on Concourse A and depart from Concourse C, which makes the transfer straightforward: find the AeroTrain station at Concourse A, take it outbound to Concourse C, then proceed immediately to your departure gate.

Here are a couple of tricks if that is not the case:

  • The midfield terminals are some distance from the main terminal, so it is never worth your while to take a train or mobile lounge back to the main terminal to transfer back out again. Staying midfield also negates any risk of accidentally leaving the secure area and having to re-clear TSA.

  • There is no way to get between A/B and C/D on foot.

  • The AeroTrain station does not serve Concourse D. It serves Concourse C but because the (35-year old) Concourse C is a "temporary" terminal, the train overshoots it by a couple hundred hundred yards, stopping near the future "permanent" terminal. For lower-numbered D gates, therefore, it can be faster to take the mobile lounge from A to D and backtrack than to take the AeroTrain from A to C and walk down and over. On the flip side, the trains run every three or four minutes, whereas the "mobile lounges" (which may be referred to as "shuttles," or by aficionados as "moon buggies") are much less frequent.

In the event you do not receive a boarding pass for your IAD-FRA flight when you first check in, do not waste time trying to print it out at Dulles until you get to the gate for your connection; if there are no kiosks, the gate agent will assist you.

Assuming you booked this all on a single ticket, your chances of making the connection are reasonably good; United does not make money by instigating misconnections for their own sake. If your inbound flight is canceled or delayed, speak to a customer service agent on the phone, or preferably in person at the airport. They will work to accommodate you on a later flight on United or one of its transatlantic partners at no extra cost to you, though it will not necessarily be the next available flight out. If you are forced to stay overnight because of a problem caused by United (e.g. staff unavailability or aircraft maintenance), they should also provide you with meal and hotel vouchers.

  • "Assuming you booked this all on a single ticket, your chances of making the connection are reasonably good" were you kidding, old mate?? You've tried this one?!
    – Fattie
    Oct 27, 2018 at 3:50
  • Since this is the top answer, it's worth mentioning the overwhelming factor that will cost you the connection if you do miss it. The "partner" airline very likely is a "valet your carry on bags" small plane, and that costs an extra 5-15 minutes, which is usually the decider if the first flight is a bit late.
    – Fattie
    Oct 27, 2018 at 4:09
  • Thank you so much, @choster. It helped a lot! I did book it all in one ticket, on United website. The "mobile lounge" is the bus?
    – Shir
    Oct 27, 2018 at 17:10
  • @Shir It functions more or less like a shuttle bus but doesn't look anything like one. Dulles is the only US airport still to use them. I think Montreal also might.
    – choster
    Oct 28, 2018 at 0:41
  • @choster Thank you! I would never imagine that it could look like THIS!
    – Shir
    Oct 28, 2018 at 21:05

If you bought both sides of the connection as part of the same ticket, from the same airline (and yes, United & United Express count as the same for this purpose), that means the airline thinks you can make it.

It also means that if the first flight is delayed long enough that you can't make it, the airline will work with you to help you reach your destination (though the extent of accommodation will depend on the reason for the delay).

There is usually no special exit/review/emigration process for leaving the US, other than that when you check in for the first flight you will need to show your passport to the airline representative, probably at the ticket counter outside security in New Orleans. They will probably mark your boarding pass for the international flight "DOCS OK" and you'll need that for boarding the next flight.

When you land at IAD, go directly to the connecting gate, checking whatever gate-listing flight status screens are nearest the gate you arrive at to find out exactly which one that is (note: it might have changed during your flight in). Once you're there you can see how much time you have for trips to a restroom, food vendor, etc. if any. Some people study terminal maps ahead of short connections; you can do that if it helps you feel more prepared.

Also make sure you do not exit the secure area, so you won't have to go through security again. There are usually clear signs ("Once you pass this point, you must continue to exit" with a large red triangle containing an exclamation point) so this mistake is relatively easy to avoid.

  • ? in the US today, airlines give nothing. Zero. If you miss a connection, especially an infamous connection like this, there is infinite fine print for them available to deny any compensation at all. Every flight these days is 100% packed, so there are no "other flights" to put you on to Europe. (Sure, you could sue, contact a consumer body etc.)
    – Fattie
    Oct 27, 2018 at 4:07
  • @Fattie If the first flight was delayed due to e.g. short staffing on the airline's side, and they sold both legs on the same ticket, the airline should get you there- maybe not on the same day, but eventually.
    – WBT
    Oct 29, 2018 at 13:52

Oh my God, I hate that connection.

It is an incredibly quick way to get back to Europe from certain parts of the US, but the connection is hair-raising.

The overwhelming problem is

the freaking bus-thing :/

Like many US airports, IAD is comically out of date, a complete shambles.

You move between the bizarre terminal arrangement on these whacky overland-busses which kind of thread between the aircraft.

They come and go every 10 or 15 minutes or so, so it all depends on timing luck.

As choster explains you will almost certainly be going A->C. You DO have to use the aero-bussy device. (DON'T try the other possibilities.)

be aware you're travelling on one of the comic "partner" airlines

To avoid safety and cost regulations, actual airlines in the US use "partner" airlines for short flights. Your first flight on united "express" will be comic.

Get off the plane and run like crazy

be aware of the valet'd bag issue - this will likely determine if you make the connection or not

On your first comic flight on united "express". If you have a typical rollon "full size" carry on bag, it does not, repeat not, fit inside the aircraft.

Right at the gate, they will put it in the luggage tray of your "airplane".

When you arrive at IAD, you have to wait quite a few minutes until the (polite) ground handlers pull the "valet'd" bags out and hand them out.

This will cost you a good ten minutes.

I travel with nothing, but for this very purpose I specifically have a small carry on bag (with wheels!) which does fit inside these commuter planes, if I have to carry a few laptops or whatever.

When you get out of the first flight,

  1. run like hell to the stupid Aero-Bussy. ask clearly where it is to get to C and don't consider any other options to get to C

  2. pray you connect quickly with the Aero-Bussy. If you see one pulling away as you run towards it, you're probably buggered

  3. Frankfurt inevitably seems at the far left end of C - you likely have to literally run

As with any tight connection, everything could go perfectly smoothly and you'll have no problem at all.

But missed connections are so common now in the US you might as well plan for the worst.

check on the awesome data sites about your first flight

Say your first flight is on ComicUnitedExpress100. Use the awesome data sites to examine the recent flight history of CUE100. (Simply google "recent flight history CUE100") You will learn if it tends to be late.

and finally the ultimate tip:

there is usually an earlier flight, and United will usually put you on it

carefully check regarding your first flight. Is there another one earlier?

Normally you can call United and the conversation goes like this. "As you can see I'm on 100 then 747 to frankfurt with that (insert knowing laugh) connection at IAD. Would you mind changing me to the earlier flight 69 - I just had a knee operation and I'm not able to run."

They'll normally waive the fee and change it for free (well, that's happened to me every time in similar situation with AA or United).

Of course, there may be no earlier flight or you may not be able to take it.

Good luck!

Wear track shoes.

Don't forget the "Will my luggage get 'valeted'?" issue, which is critical.

Finally to cheer you up remember this - you could be connecting in Chicago.

  • There is no A-C mobile lounge and there has not been for years. The AeroTrain is the best option for an A-C connection, and the ride itself is only a few minutes.
    – choster
    Oct 28, 2018 at 0:32
  • Hmm, I'm talking about the elevated moon-buggie like thing, with doors on each end - which travels across the aircraft taxiways - I just took it the week before last!
    – Fattie
    Oct 28, 2018 at 3:41
  • (regarding the Aero-Train .. ie as seen in this photo flydulles.com/iad/… .. i've actually never been on that conveyance!)
    – Fattie
    Oct 28, 2018 at 3:41
  • Normally, the moon buggies only operate now from the main terminal to D and from Concourse A to D, and for international arrivals. I believe the docks are still there and they get put back in service when the train is undergoing maintenance.
    – choster
    Oct 28, 2018 at 13:06
  • Ah .. perhaps I'm confusing D with C. (They're the "two ends" of the same strip, I believe?) If so, sorry ... !
    – Fattie
    Oct 28, 2018 at 13:38

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