United Flight 3540 Deals & Information (2025/2026)

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United Flight 3540 Route Deals From $93

The cheapest prices found with in the last 7 days for return flights were $179 and $93 for one-way flights to Pittsburgh Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Oct 30 - Sun, Nov 2
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$179 Roundtrip, found 1 day ago
$179
Roundtrip
found 1 day ago
Select United flight, departing Thu, Oct 30 from Washington Dulles Intl. to Pittsburgh Intl., returning Sun, Nov 2, priced at $179 found 1 day ago
Sat, Oct 18 - Mon, Oct 20
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$182 Roundtrip, found 4 days ago
$182
Roundtrip
found 4 days ago
Select United flight, departing Sat, Oct 18 from Washington Dulles Intl. to Pittsburgh Intl., returning Mon, Oct 20, priced at $182 found 4 days ago
Sat, Nov 1 - Mon, Nov 3
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$182 Roundtrip, found 2 days ago
$182
Roundtrip
found 2 days ago
Select United flight, departing Sat, Nov 1 from Washington Dulles Intl. to Pittsburgh Intl., returning Mon, Nov 3, priced at $182 found 2 days ago
Thu, Oct 30 - Sun, Nov 2
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$187 Roundtrip, found 1 day ago
$187
Roundtrip
found 1 day ago
Select United flight, departing Thu, Oct 30 from Washington Dulles Intl. to Pittsburgh Intl., returning Sun, Nov 2, priced at $187 found 1 day ago
Thu, Oct 30 - Sun, Nov 2
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$208 Roundtrip, found 1 day ago
$208
Roundtrip
found 1 day ago
Select United flight, departing Thu, Oct 30 from Washington Dulles Intl. to Pittsburgh Intl., returning Sun, Nov 2, priced at $208 found 1 day ago
Sat, Nov 1 - Mon, Nov 3
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$213 Roundtrip, found 2 days ago
$213
Roundtrip
found 2 days ago
Select United flight, departing Sat, Nov 1 from Washington Dulles Intl. to Pittsburgh Intl., returning Mon, Nov 3, priced at $213 found 2 days ago
Thu, Oct 30 - Sun, Nov 2
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$216 Roundtrip, found 1 day ago
$216
Roundtrip
found 1 day ago
Select United flight, departing Thu, Oct 30 from Washington Dulles Intl. to Pittsburgh Intl., returning Sun, Nov 2, priced at $216 found 1 day ago

Frequently asked questions

What route does flight number UA3540 take?
UA3540 takes several routes. The most frequently flown is between Louisville Muhammad Ali Intl. Airport and ORD, which flies direct. This service generally takes 1 hour and 36 minutes. That said, there may possibly be other flights with this number that are multi-stop.
What kind of plane is on flight number UA3540?
If you're considering booking flight UA3540 from Louisville Muhammad Ali Intl. Airport to O'Hare Intl. Airport (ORD), you'll likely be heading off on an Embraer 170. Flight UA3540 serves a number of different routes, but this is the most popular.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA3540 flight with Travelocity, please visit our Customer Service Portal.